A large ribonucleoprotein complex that is an early preribosomal complex. In S. cerevisiae, it has a size of 80S and consists of the 35S pre-rRNA, early-associating ribosomal proteins most of which are part of the small ribosomal subunit, the U3 snoRNA and associated proteins. (Gene Ontology, GO_0032040)
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10 proteins localized to the small-subunit processome cellular component from the COMPARTMENTS Curated Protein Localization Evidence Scores dataset.